US3922777A - Process for the production of layer circuits with conductive layers on both sides of a ceramic substrate - Google Patents

Process for the production of layer circuits with conductive layers on both sides of a ceramic substrate Download PDF

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US3922777A
US3922777A US438865A US43886574A US3922777A US 3922777 A US3922777 A US 3922777A US 438865 A US438865 A US 438865A US 43886574 A US43886574 A US 43886574A US 3922777 A US3922777 A US 3922777A
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pin
metal
ceramic
ceramic substrate
sides
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US438865A
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Artur Weitze
Peter Leskovar
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Siemens AG
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Siemens AG
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/4038—Through-connections; Vertical interconnect access [VIA] connections
    • H05K3/4046—Through-connections; Vertical interconnect access [VIA] connections using auxiliary conductive elements, e.g. metallic spheres, eyelets, pieces of wire
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
    • H05K3/4626—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials
    • H05K3/4629—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials laminating inorganic sheets comprising printed circuits, e.g. green ceramic sheets
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern
    • H05K1/092—Dispersed materials, e.g. conductive pastes or inks
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10227—Other objects, e.g. metallic pieces
    • H05K2201/10416—Metallic blocks or heatsinks completely inserted in a PCB
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49155—Manufacturing circuit on or in base
    • Y10T29/49163—Manufacturing circuit on or in base with sintering of base

Definitions

  • a multi-layer composite can be made up by stacking a plurality of such substrates together with UNITED STATES PATENTS pins being provided to lock the substrates together 3,488,429 1/l970 Boucher 29/625 X and the entire mu]ti ]ayer body is then sintered.
  • PROCESS FOR THE PRODUCTION OF LAYER CIRCUITS WITH CONDUCTIVE LAYERS ON BOTH SIDES OF A CERAMIC SUBSTRATE BACKGROUND OF THE INVENTION 1.
  • Field of the Invention This invention is in the field of printed circuits and is directed specifically to an improved process for providing through pins between the conductive layers.
  • Printed circuits of the layer type which are provided with through contacts are being produced in accordance with various processes.
  • a thick paste containing metal particles dispersed therethrough is inserted into the holes in the ceramic body, or the walls of the holes are wetted with a highly fluid metal dispersion which, after the sintering process, provides a conductive connection between the layers on opposite sides of the ceramic substrate.
  • the holes are exposed to vapor deposition of metal in such a manner that a conductive film is deposited in the walls of the holes.
  • Other constructions produce a conductive connection between the layers by means of contacts at the edge of the substrate, or metal pins which are soldered into the holes to produce the electrical connection.
  • German Laid Open application Ser. No. 1,301,378 describes a process for producing a ceramic block having metal lined capillary tubes.
  • Green ceramic laminae are pierced to provide the desired geometry for the capillary system.
  • the perforations and the surfaces of the laminae are coated with a metallic paste containing a volatilizable additive.
  • the laminae are stacked to form a block and heated in order to expel the additives. After this, the laminae are sintered.
  • the capillaries which are lined with metal in this manner can also be filled with molten metals which produce highly conductive electrical connections.
  • the block is submerged into a copper or aluminum bath under substantially reduced pressure conditions. In the case of a copper bath, a dry hydrogen atmosphere is used.
  • the principal object of the present invention is to provide layer type printed circuits with contacts of high conductivity and high mechanical strength, and to produce the same in a relatively simple process.
  • pins consisting of metals having high melting points, said pins being inserted into appropriate holes provided in a still green (unfired) ceramic substrate.
  • These high melting point metals can be noble metals of the platinum group, particularly platinum or palladium, or they may be refractory metals such as molybdenum or tungsten. Since the through contacts consist of solid material, they provide a much greater degree of conductiv- 5 compacts. The diameter and the length of the pins must in each case provide for the shrinkage of the substrate which occurs during sintering. It is advantageous also to add silicates to the material of the pins or to encase the pins with such silicates.
  • the pins are contacted in accordance with the known processes for producing conductive films by the thick or thin film techniques.
  • the substrates are perforated while still green, and provided with contacting pins and printed with conductor paths.
  • a plurality of substrates are then stacked up and compressed under pressure and heat.
  • the substrate, the through contacts and the conductor paths are then sintered to form a sealed, ceramic body.
  • the pins consisting of the above-mentioned refractory metals can be overlaid with appropriate pastes such as tungsten pins provided with tungsten pastes, both requiring a reducing atmosphere.
  • the pins consisting of noble metals of the platinum group permit the burning process to be carried out in an oxidizing atmosphere.
  • FIG. 1 is a cross-sectional view of an embodiment of the present invention.
  • FIG. 2 is a view similar to FIG. 1 but showing a multilayer construction.
  • FIG. 1 illustrates a ceramic substrate 1 provided with a suitable aperture through which a contacting pin 2 extends to bridge conductor paths 3 located on opposite sides of the ceramic substrate 1.
  • the aperture is provided in the substrate while the ceramic substrate is still in its green condition.
  • These pins can consist of noble metals of the platinum group or refractory metals such as molybdenum or tungsten.
  • the ceramic body with the pins located therein is then subjected to sinter- 3 ing procedures appropriate to the ceramic being used causing the ceramic to shrink about the pins and provide a tight bond therewith.
  • the conductive layers 3 are applied by the thick or thin film technique for the application of conductive paths on ceramic substrates.
  • FIG. 2 The structure in FIG. 2 is similar to that shown in FIG. 1 except that it shows a plurality of substrates 1 being bonded together with the pins 3 interconnecting the conductive layers of the multi-layer construction.
  • pin compositions according to the present invention, the following may be mentioned.
  • One may use a high melting metal compact produced by powder metallurgy and to which 2-18 weight percent manganese silicate was added to the metal powder.
  • a pulverized lead borosilicate glass may be added in the same amount.
  • the pins may, as a further example, consist of a drawn platinum wire coated with a 525 micron layer of lead borosilicate glass.
  • a process for the production of layer-type printed circuits having conductive layers on both sides of a ceramic substrate which comprises providing an aperture in a green ceramic substrate, inserting into said aperture, a high melting metal pin having incorporated therewith metal silicate, and thereafter sintering the green substrate under conditions to produce a solid state reaction between the ceramic and the silicate, the dimensions of said pin being such that the ends of said pin, upon shrinkage of said green substrate due to sintering, are flush with said sides.
  • metal silicate is selected from the group consisting of manganese silicate and lead borosilicate.

Abstract

Process for the production of layer-type printed circuits having conductive layers on both sides of a ceramic substrate in which an aperture is provided in a green (unfired) ceramic substrate, a high melting point pin is inserted into the aperture and thereafter the green substrate is sintered to bond the pin in place and provide for electrical connection between the two layers. A multi-layer composite can be made up by stacking a plurality of such substrates together with pins being provided to lock the substrates together and the entire multi-layer body is then sintered.

Description

United States Patent 1 1 3,922,777 Weitze et a1. [45 D 2, 1975 [5 1 PROCESS FOR THE PRODUCTION OF 3,561,110 2/1971 Fculner et a] 264/61 UX L Y CIRCUITS WITH CONDUCTIVE 3,772,748 11/1973 Rutt, LAYERS ON BOTH SIDES OF A CERAMIC 3,798,762 3/1974 Hams ct a1. 29/626 SUBSTRATE FOREIGN PATENTS OR APPLICATIONS [75] Inventors, Artur Weitze, puuach; Peter 856,584 12/1960 United Kingdom 174/685 Leskovar, Munich, both of Germany OTHER PUBLICATIONS [73] Assignee: Siemens Aktiengesellschaft, Berlin & McIntosh, Multilayer Ceramic Sandwiches, IBM
Munich, Germany Tech. Disc]. Bull, Vol. 16, No. 1, June 1973, p. 43. [22] Filed: 1974 Primary Examiner-Milton S. Mehr [21] Appl. No.: 438,865 Assistant Examiner-Joseph A. Walkowski Attorney, Agent, or FirmHill, Gross, Simpson, Van 30 Foreign Application Priority Data Swen steadman Chara Feb. 8, 1973 Germany 2306236 [57] ABSTRACT [52 US. c1. 29/628' 29/625' 174/68.5' Pmcess for the Production layer-type Primed 317/101 cuits having conductive layers on both sides of a ce- 51 Int. Cl. H01R 43/00 ramic Substrate in which an aperture is Pmvided a 58 Field of Search 29/624 625 628' green (unfired) ceramic Substratehigh meling 174/685; 317/261 101 B point pin is inserted into the aperture and thereafter 264/58 61 the green substrate is sintered to bond the pin .in place a and provide for electrical connection between the two [56] References Cited layers. A multi-layer composite can be made up by stacking a plurality of such substrates together with UNITED STATES PATENTS pins being provided to lock the substrates together 3,488,429 1/l970 Boucher 29/625 X and the entire mu]ti ]ayer body is then sintered. 3,517,437 6/1970 Szobonya... 29/625 X 3,540,894 11/1970 Mclntosh 264/61 X 5 Claims, 2 Drawing Figures /nn/ I U.S. Patent Dec. 2, 1975 3,922,777
PROCESS FOR THE PRODUCTION OF LAYER CIRCUITS WITH CONDUCTIVE LAYERS ON BOTH SIDES OF A CERAMIC SUBSTRATE BACKGROUND OF THE INVENTION 1. Field of the Invention This invention is in the field of printed circuits and is directed specifically to an improved process for providing through pins between the conductive layers.
DESCRIPTION OF THE PRIOR ART Printed circuits of the layer type which are provided with through contacts are being produced in accordance with various processes. In the thick layer technique, a thick paste containing metal particles dispersed therethrough is inserted into the holes in the ceramic body, or the walls of the holes are wetted with a highly fluid metal dispersion which, after the sintering process, provides a conductive connection between the layers on opposite sides of the ceramic substrate. In the thin film technique, the holes are exposed to vapor deposition of metal in such a manner that a conductive film is deposited in the walls of the holes. Other constructions produce a conductive connection between the layers by means of contacts at the edge of the substrate, or metal pins which are soldered into the holes to produce the electrical connection. In accordance with German Laid Open application Ser. No. 1,590,345, copper pins are employed which are coated with a hard soldering agent. A short surge of current is delivered to the coated copper pins to heat the same to a temperature at which the hard soldering agent melts without effecting the conductive layers. A common feature of these processes is that the substrates are sintered before the through contacts are produced.
German Laid Open application Ser. No. 1,301,378 describes a process for producing a ceramic block having metal lined capillary tubes. Green ceramic laminae are pierced to provide the desired geometry for the capillary system. The perforations and the surfaces of the laminae are coated with a metallic paste containing a volatilizable additive. Then, the laminae are stacked to form a block and heated in order to expel the additives. After this, the laminae are sintered. The capillaries which are lined with metal in this manner can also be filled with molten metals which produce highly conductive electrical connections. To accomplish this, the block is submerged into a copper or aluminum bath under substantially reduced pressure conditions. In the case of a copper bath, a dry hydrogen atmosphere is used.
The principal object of the present invention is to provide layer type printed circuits with contacts of high conductivity and high mechanical strength, and to produce the same in a relatively simple process.
SUMMARY OF THE INVENTION In accordance with the present invention, we utilize pins consisting of metals having high melting points, said pins being inserted into appropriate holes provided in a still green (unfired) ceramic substrate. These high melting point metals can be noble metals of the platinum group, particularly platinum or palladium, or they may be refractory metals such as molybdenum or tungsten. Since the through contacts consist of solid material, they provide a much greater degree of conductiv- 5 compacts. The diameter and the length of the pins must in each case provide for the shrinkage of the substrate which occurs during sintering. It is advantageous also to add silicates to the material of the pins or to encase the pins with such silicates. During the sintering of the ceramic, solid phase reactions take place in the presence of the silicates which secure the metal more firmly to the substrate than by the shrinkage of the substrate during sintering alone in the ceramic material. The through contacts produced in this way are vacuum tight.
Following the sintering process, the pins are contacted in accordance with the known processes for producing conductive films by the thick or thin film techniques. For thick layer circuits, it is advantageous to apply the conductor path pastes to the still green substrate after the insertion of the pins and prior to the sintering of the ceramic. By means of this technique, it is also possible to produce multi-layer circuits. The substrates are perforated while still green, and provided with contacting pins and printed with conductor paths. A plurality of substrates are then stacked up and compressed under pressure and heat. In a subsequent sintering process, at temperatures of between l450C and 1800C, the substrate, the through contacts and the conductor paths are then sintered to form a sealed, ceramic body.
Not all ceramic substrates with through contacts and conductor paths can be readily metallized in an oxidizing frame. Refractory metals require a reducing atmosphere during the burning process, while most thick film materials require an oxidizing atmosphere. Accordingly, the pins consisting of the above-mentioned refractory metals can be overlaid with appropriate pastes such as tungsten pins provided with tungsten pastes, both requiring a reducing atmosphere. The pins consisting of noble metals of the platinum group permit the burning process to be carried out in an oxidizing atmosphere.
BRIEF DESCRIPTION OF THE DRAWINGS Other objects, features and advantages of the invention will be readily apparent from the following description of certain preferred embodiments thereof, taken in conjunction with the accompanying drawings, although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure, and in which:
FIG. 1 is a cross-sectional view of an embodiment of the present invention; and
FIG. 2 is a view similar to FIG. 1 but showing a multilayer construction.
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates a ceramic substrate 1 provided with a suitable aperture through which a contacting pin 2 extends to bridge conductor paths 3 located on opposite sides of the ceramic substrate 1. The aperture is provided in the substrate while the ceramic substrate is still in its green condition. These pins can consist of noble metals of the platinum group or refractory metals such as molybdenum or tungsten. The ceramic body with the pins located therein is then subjected to sinter- 3 ing procedures appropriate to the ceramic being used causing the ceramic to shrink about the pins and provide a tight bond therewith. After the sintering process, the conductive layers 3 are applied by the thick or thin film technique for the application of conductive paths on ceramic substrates.
The structure in FIG. 2 is similar to that shown in FIG. 1 except that it shows a plurality of substrates 1 being bonded together with the pins 3 interconnecting the conductive layers of the multi-layer construction.
As examples of suitable pin compositions according to the present invention, the following may be mentioned. One may use a high melting metal compact produced by powder metallurgy and to which 2-18 weight percent manganese silicate was added to the metal powder. Alternatively, a pulverized lead borosilicate glass may be added in the same amount. The pins may, as a further example, consist of a drawn platinum wire coated with a 525 micron layer of lead borosilicate glass.
It should be evident that various modifications can be made to the described embodiments without departing from the scope of the present invention.
We claim as our invention: 7
1. A process for the production of layer-type printed circuits having conductive layers on both sides of a ceramic substrate which comprises providing an aperture in a green ceramic substrate, inserting into said aperture, a high melting metal pin having incorporated therewith metal silicate, and thereafter sintering the green substrate under conditions to produce a solid state reaction between the ceramic and the silicate, the dimensions of said pin being such that the ends of said pin, upon shrinkage of said green substrate due to sintering, are flush with said sides.
2. The process in accordance with claim 1 in which the high melting metal pin is produced by powdered metallurgy and the metal silicate is incorporated therein by adding it to the metal powder.
3. The method in accordance with claim 2 in which the metal silicate is selected from the group consisting of manganese silicate and lead borosilicate.
4. The process in accordance with claim 1 in which the metal silicate is incorporated in the metal pin by coating the pin with a layer of the metal silicate glass.
5. The method in accordance with claim 4 in which the 'metal silicate is lead borosilicate.

Claims (5)

1. A process for the production of layer-type printed circuits having conductive layers on both sides of a ceramic substrate which comprises providing an aperture in a green ceramic substrate, inserting into said aperture, a high melting metal pin having incorporated therewith metal silicate, and thereafter sintering the green substrate under conditions to produce a solid state reaction between the ceramic and the silicate, the dimensions of said pin being such that the ends of said pin, upon shrinkage of said green substrate due to sintering, are flush with said sides.
2. The process in accordance with claim 1 in which the high melting metal pin is produced by powdered metallurgy and the metal silicate is incorporated therein by adding it to the metal powder.
3. The method in accordance with claim 2 in which the metal silicate is selected from the group consisting of manganese silicate and lead borosilicate.
4. The process in accordance with claim 1 in which the metal silicate is incorporated in the metal pin by coating the pin with a layer of the metal silicate glass.
5. The method in accordance with claim 4 in which the metal silicate is lead borosilicate.
US438865A 1973-02-08 1974-02-01 Process for the production of layer circuits with conductive layers on both sides of a ceramic substrate Expired - Lifetime US3922777A (en)

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JP (1) JPS5760796B2 (en)
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FR (1) FR2217905B1 (en)
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Cited By (15)

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US4313262A (en) * 1979-12-17 1982-02-02 General Electric Company Molybdenum substrate thick film circuit
EP0080535B1 (en) * 1981-11-27 1985-08-28 Krohne AG Measuring head for an electro-magnetic flow meter
US4598167A (en) * 1983-07-27 1986-07-01 Hitachi, Ltd. Multilayered ceramic circuit board
WO1988005959A1 (en) * 1987-02-04 1988-08-11 Coors Porcelain Company Ceramic substrate with conductively-filled vias and method for producing
US4771537A (en) * 1985-12-20 1988-09-20 Olin Corporation Method of joining metallic components
US4783722A (en) * 1985-07-16 1988-11-08 Nippon Telegraph And Telephone Corporation Interboard connection terminal and method of manufacturing the same
US4825539A (en) * 1987-03-27 1989-05-02 Fujitsu Limited Process for manufacturing a multilayer substrate
US5223790A (en) * 1991-05-10 1993-06-29 Metricom, Inc. Current sensor using current transformer with sintered primary
US5280414A (en) * 1990-06-11 1994-01-18 International Business Machines Corp. Au-Sn transient liquid bonding in high performance laminates
EP0591761A2 (en) * 1992-09-22 1994-04-13 Matsushita Electric Industrial Co., Ltd. A two-sided printed circuit board, a multi-layered printed circuit board, and a method for producing the same
US5337475A (en) * 1991-03-20 1994-08-16 International Business Machines Corporation Process for producing ceramic circuit structures having conductive vias
US6048424A (en) * 1997-01-17 2000-04-11 Denso Corporation Method for manufacturing ceramic laminated substrate
US7084350B2 (en) 2001-10-13 2006-08-01 Robert Bosch Gmbh Green ceramic insert, ceramic insert, ceramic green body or green body composite and ceramic laminated composite produced thereby
US20110000699A1 (en) * 2009-06-04 2011-01-06 David Joseph Bealka Co-fired metal and ceramic composite feedthrough assemblies for use at least in implantable medical devices and methods for making the same
US11554509B1 (en) * 2021-07-13 2023-01-17 Lowell Dean Feil Drip irrigation feeder pipe slicer tool and method of detaching barbed fittings and devices using the same

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JPS62265796A (en) * 1986-05-14 1987-11-18 株式会社住友金属セラミックス Ceramic multilayer interconnection board and manufacture of the same
DE3709770A1 (en) * 1987-03-25 1988-10-13 Ant Nachrichtentech Circuit board, conductor foil, multilayer inner laminate or conductor substrate with through-connections and a production process
DE4318061C2 (en) * 1993-06-01 1998-06-10 Schulz Harder Juergen Method of manufacturing a metal-ceramic substrate
DE10247409B4 (en) * 2002-10-11 2008-09-25 Robert Bosch Gmbh Ceramic substrate body and method for its production
DE102015202669A1 (en) * 2015-02-13 2016-09-01 Robert Bosch Gmbh Circuit carrier and method for producing a circuit carrier

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US3798762A (en) * 1972-08-14 1974-03-26 Us Army Circuit board processing

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US3423517A (en) * 1966-07-27 1969-01-21 Dielectric Systems Inc Monolithic ceramic electrical interconnecting structure
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US3540894A (en) * 1967-03-29 1970-11-17 Ibm Eutectic lead bisilicate ceramic compositions and fired ceramic bodies
US3517437A (en) * 1967-06-19 1970-06-30 Beckman Instruments Inc Method of forming a terminal structure in a refractory base
US3561110A (en) * 1967-08-31 1971-02-09 Ibm Method of making connections and conductive paths
US3488429A (en) * 1969-02-24 1970-01-06 Gerald Boucher Multilayer printed circuits
US3772748A (en) * 1971-04-16 1973-11-20 Nl Industries Inc Method for forming electrodes and conductors
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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313262A (en) * 1979-12-17 1982-02-02 General Electric Company Molybdenum substrate thick film circuit
EP0080535B1 (en) * 1981-11-27 1985-08-28 Krohne AG Measuring head for an electro-magnetic flow meter
US4598167A (en) * 1983-07-27 1986-07-01 Hitachi, Ltd. Multilayered ceramic circuit board
US4783722A (en) * 1985-07-16 1988-11-08 Nippon Telegraph And Telephone Corporation Interboard connection terminal and method of manufacturing the same
US4897918A (en) * 1985-07-16 1990-02-06 Nippon Telegraph And Telephone Method of manufacturing an interboard connection terminal
US4771537A (en) * 1985-12-20 1988-09-20 Olin Corporation Method of joining metallic components
WO1988005959A1 (en) * 1987-02-04 1988-08-11 Coors Porcelain Company Ceramic substrate with conductively-filled vias and method for producing
US4825539A (en) * 1987-03-27 1989-05-02 Fujitsu Limited Process for manufacturing a multilayer substrate
US5280414A (en) * 1990-06-11 1994-01-18 International Business Machines Corp. Au-Sn transient liquid bonding in high performance laminates
US5337475A (en) * 1991-03-20 1994-08-16 International Business Machines Corporation Process for producing ceramic circuit structures having conductive vias
US5223790A (en) * 1991-05-10 1993-06-29 Metricom, Inc. Current sensor using current transformer with sintered primary
EP0591761A2 (en) * 1992-09-22 1994-04-13 Matsushita Electric Industrial Co., Ltd. A two-sided printed circuit board, a multi-layered printed circuit board, and a method for producing the same
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Also Published As

Publication number Publication date
JPS5760796B2 (en) 1982-12-21
DE2306236A1 (en) 1974-08-15
NL7401287A (en) 1974-08-12
GB1424642A (en) 1976-02-11
IT1007177B (en) 1976-10-30
JPS49112164A (en) 1974-10-25
DE2306236C2 (en) 1982-11-25
LU69334A1 (en) 1974-05-17
FR2217905A1 (en) 1974-09-06
BE810777A (en) 1974-05-29
FR2217905B1 (en) 1979-08-03

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